Kaiser Permanente of Washington, Seattle, WA (K.A.L., S.D., H.A.T.); Geisinger, Danville, PA (A.K.R., A.B., A.S., J. Williams, M.S.W.); Columbia University, New York, NY (P.A., W.K.C., M.M., H.M.R., J. Wynn); Northwestern University, Evanston, IL (S.A., A.G., C.H., M.E.S., S.L.V.D.); Vanderbilt University Medical Center, Nashville, TN (S.T.B., E.W.C., R.C.G., J.F.P., D.M.R., G.L.W.); Harvard University, Cambridge, MA (K.D.C., E.P., C.L.B.Z.); University of Washington, Seattle, WA (D.C., G.P.J.); National Institutes of Health, Bethesda, MD (J.D.); Children's Hospital of Philadelphia, Philadelphia, PA (H.H., M.H.H.); Kaiser Permanente Washington Health Research Institute, Seattle, WA (N.H., E.B.L., J.D.R.); Boston Children's Hospital, Boston, MA (I.A.H.); Mayo Clinic, Rochester, MN (I.J.K., N.M.L., R.R.S.); Baptist Memorial Health Center, Memphis, TN (P.E.L.); Cincinnati Children's Hospital and Medical Center, Cincinnati, OH (M.F.M., C.A.P.); Meharry Medical College, Nashville, TN (S.P., R.S.); and Arizona State University, Tempe, AZ (G.S.)